Braking Resistors
03.2004
6SE7087-2CX87-2DA0 Siemens
AG
4-2
Unità di frenatura / Braking Unit
SIMOVERT MASTERDRIVES
4.1
Definitions of the power ratings
Braking unit with external resistor
Braking unit with internal resistor
P20 =
Rated
Power
P20 =
Rated
Power
P3
= Peak Power = 1.5
×
P20
P3
= Peak Power = 1.5
×
P20
PDB =
0.25
×
P20 = Steady State Power Rating
PDB = 0.03
×
P20 = Steady State Power Rating
P
t[s]
0 3
20 23
90
0
P3
P20
PDB
1.5
1
0.25
P
t[s]
1.7 2.5
72.5
0
0
P3
P20
PDB
1.5
1
0.03
Fig. 4-1
Load characteristics of the braking units